CVE-2021-21396 is a medium-severity information disclosure vulnerability affecting Wire's open-source backend, wire-server, in versions prior to 2021-03-02. Any logged-in user could access client metadata (id, class, type, location, time, cookie) of other users via the GET /users/list-clients endpoint, provided they knew the target's User ID. This vulnerability has a CVSS score of 6.5 (Medium), indicating a network-based attack with low complexity, requiring low privileges, and resulting in high confidentiality impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 2021-02-16, < 2021-03-02CPE matchmatch criteria | cpe:2.3:a:wire:wire_server:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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